Many many thanks for your kind help and your excellent program.

If there is only one type of basins, then there is no reason to use b.

Sorry for not being clear. Does the b option require two basin types or can just one be used.

I don't understand your meaning. As can be seen from the list, ClF5 have two types of basins, namely C (Core) and 1-synaptic V (Valence)

Many thanks for the video. I have got it to work. I have used cd in the vmd window to go to the current working directory using cd c:/folder etc.

What is the correct answer to the b command when there is only one type of basin (no 2-synaptic basins) as in ClF5?

Sorting basins according to labels...
The following information is printed according to order of basin labels
Basin indices, populations (e), volumes (Angstrom^3) and assigned labels
#    1  Basin   15  Pop.:  2.2556  Vol.:    0.003  Label: C(Cl1)
#    2  Basin   19  Pop.:  2.1474  Vol.:    0.026  Label: C(F4)
#    3  Basin   17  Pop.:  2.2113  Vol.:    0.026  Label: C(F3)
#    4  Basin   14  Pop.:  7.7482  Vol.:    0.346  Label: C(Cl1)
#    5  Basin    6  Pop.:  2.1938  Vol.:    0.026  Label: C(F2)
#    6  Basin   13  Pop.:  2.1186  Vol.:    0.025  Label: C(F5)
#    7  Basin   12  Pop.:  2.2079  Vol.:    0.025  Label: C(F6)
#    8  Basin    8  Pop.:  0.4998  Vol.:    0.538  Label: V(Cl1)
#    9  Basin    9  Pop.:  0.4945  Vol.:    0.528  Label: V(Cl1)
#   10  Basin   10  Pop.:  0.5004  Vol.:    0.539  Label: V(Cl1)
#   11  Basin    7  Pop.:  0.8436  Vol.:    0.931  Label: V(Cl1)
#   12  Basin   18  Pop.:  7.1988  Vol.:   83.540  Label: V(F4)
#   13  Basin   16  Pop.:  0.4949  Vol.:    0.526  Label: V(Cl1)
#   14  Basin    5  Pop.:  2.4478  Vol.:   46.739  Label: V(Cl1)
#   15  Basin    4  Pop.:  7.2012  Vol.:   82.722  Label: V(F3)
#   16  Basin    3  Pop.:  7.2085  Vol.:   77.508  Label: V(F2)
#   17  Basin    2  Pop.:  7.2123  Vol.:   83.916  Label: V(F5)
#   18  Basin   11  Pop.:  0.1322  Vol.:    0.070  Label: V(F6)
#   19  Basin    1  Pop.:  6.9126  Vol.:   69.651  Label: V(F6)

Number of core basins is     7, their indices:
6,12-15,17,19
Number of  1-synaptic basins is    12, their indices:
1-5,7-11,16,18

                  ============= Basin analysis =============

Please check this video illustration, hope this could clarify enough. I am using VMD 1.9.3 and Multiwfn 3.8(dev) updated on 2022-Oct-4
//www.umsyar.com/multiwfn/forum_attach/568.mp4

I have tried many times with different compounds but I always get the same result. I don't know what I am doing wrong. I am sorry to be looking for so much help. Are cub and vmd files available for an example which I could try to emulate?

Perhaps the grid data was not properly generated. Please double check steps described in Section 4.17.10 of Multiwfn manual, and use latest version of Multiwfn, and make sure that VMD is 1.9.3 32bit version.

Many Thanks for your kind reply

Yes this changes the color

In Graphics - Representation, you can set coloring method to ColorID and then specify a color, does this manner properly change color on your computer?

I have tried three different PCs with updated graphics drivers and I get the same result.
I have tried setting the environment variable "VMDSIMPLEGRAPHICS" to "1" and the result is that the black is changed to light grey.
I will try more PCs.

Thanks

Often, this problems comes from incompatibility between VMD and running environment or graphical card, please use another computer or upgrade graphical card driver and retry.

Please upload a screenshot

I have a problem getting VMD to display ELF analysis in color. I have followed the oxirane example in the manual. The picture I get in VMD is exactly as the manual however the only color for the surfaces is black. The "atoms" are colored correctly i.e. O is red. I have tried several other examples and the I only get black surfaces. The cub and VMD files are all in the same folder. Is it correct to use VMD command "Load visualization state" to load the VMD file?